Question

va rog!dau coroana!!!!!!​

Answer 1

Răspuns:

²⁾4/5-a/10=7/10

8/10-a/10=7/10

8-a=7

a=8-7=>a=1

___________

5/a+4/3=17/9

5/a=17/9-³⁾4/3

5/a=17/9-12/9

5/a=5/9

5a=9·5=>a=45:5=>a=9

Answer 2

Răspuns:

Explicație pas cu pas:

$\large \bf a)~~\dfrac{4}{5}-\dfrac{\boxed{}}{10}=\dfrac{7}{10}$

$\large \bf \dfrac{4\cdot 2}{5\cdot 2}-\dfrac{\boxed{}}{10}=\dfrac{7}{10}$

$\large \bf \dfrac{8}{10}-\dfrac{\boxed{}}{10}=\dfrac{7}{10}$

$\large \bf \dfrac{8}{10}=\dfrac{7}{10} +\dfrac{\boxed{}}{10}$

$\large \bf \dfrac{8}{10}-\dfrac{7}{10} =\dfrac{\boxed{}}{10}$

$\large \bf \dfrac{1}{10}=\dfrac{\boxed{}}{10}$

$\large \bf 1 \cdot 10=\boxed{}\cdot 10~~~\bigg|:10$

$\color{red}\Large \bf \boxed{\bf \boxed{}=1}$

$\it~~$

$\large \bf b)~~\dfrac{5}{\boxed{}}+ \dfrac{4}{3}=\dfrac{17}{9}$

$\large \bf ~\dfrac{5}{\boxed{}}+ \dfrac{4\cdot 3}{3\cdot 3}=\dfrac{17}{9}$

$\large \bf ~\dfrac{5}{\boxed{}}+ \dfrac{12}{9}=\dfrac{17}{9}$

$\large \bf ~\dfrac{5}{\boxed{}}=\dfrac{17}{9} - \dfrac{12}{9}$

$\large \bf ~\dfrac{5}{\boxed{}}=\dfrac{5}{9} \implies5\cdot \boxed{} = 5\cdot 9$

$\large \bf 5\cdot \boxed{} = 45 ~~~~\bigg|:5$

$\color{red}\Large \bf \boxed{\bf \boxed{}=9}$

==pav38==